High-Temperature 3D Printing Complete Guide: PEEK, PC, Nylon & Carbon Fiber
High-temperature 3D printing (250-500°C) enables engineering-grade materials like polycarbonate, nylon, PEEK, and carbon fiber composites — the QIDI i-Fast High Temperature Hotend ($100.99) reaches 350°C with a 50W heater and hardened steel nozzle, making it capable of PC (260-300°C), nylon (240-270°C), carbon fiber (220-260°C), and lower-temp PEEK/PEKK (350-380°C) when paired with an enclosed chamber and proper drying.
This complete guide covers everything you need to know about high-temperature 3D printing: material properties, temperature settings, hotend selection, chamber requirements, filament drying, bed adhesion, print speed, cooling, and troubleshooting. Whether you are printing polycarbonate prototypes, nylon gears, carbon fiber brackets, or PEEK medical parts, this guide provides the data and settings you need.
What Is High-Temperature 3D Printing?
High-temperature 3D printing refers to FDM printing at nozzle temperatures above 250°C, which is the practical limit of standard PTFE-lined hotends. At these temperatures, the PTFE liner begins to degrade, releasing fumes and potentially causing clogs. All-metal hotends (titanium or stainless steel heat break, no PTFE) are required for sustained printing above 250°C.
Temperature Ranges Defined
| Category | Nozzle Temp | Hotend Type | Materials |
|---|---|---|---|
| Standard | 180-250°C | PTFE-lined | PLA, PETG, ABS, TPU, PVA, HIPS |
| High-Temp Entry | 250-300°C | All-metal (300°C) | Nylon, lower PC, ASA |
| High-Temp Mid | 300-350°C | All-metal (350°C) | PC, PEKK, lower PEEK, CF-nylon |
| High-Temp Extreme | 350-500°C | All-metal (500°C) | PEEK, PEKK, PPSU, PEI |
Engineering Filament Properties
Polycarbonate (PC)
Polycarbonate is a strong, tough, transparent engineering plastic with excellent heat resistance (glass transition 150°C). It is used for protective cases, electrical housings, and impact-resistant parts.
- Nozzle temp: 260-300°C
- Bed temp: 100-120°C
- Chamber temp: 50-60°C (required to prevent warping)
- Drying: 4-6 hours at 100°C (PC absorbs moisture rapidly)
- Print speed: 30-50 mm/s
- Cooling fan: 0-30% (too much cooling causes delamination)
- Difficulty: Hard — requires enclosure, dry filament, precise temps
- Hotend required: All-metal, 300°C+ (QIDI i-Fast High-Temp recommended)
Nylon (PA — Polyamide)
Nylon is a strong, flexible, wear-resistant engineering plastic with excellent chemical resistance. It is used for gears, bearings, hinges, and functional parts.
- Nozzle temp: 240-270°C
- Bed temp: 80-100°C
- Chamber temp: 40-50°C (recommended)
- Drying: 4-6 hours at 70°C (nylon is extremely hygroscopic)
- Print speed: 40-60 mm/s
- Cooling fan: 30-50%
- Difficulty: Moderate — drying is critical
- Hotend required: All-metal recommended (250°C+), PTFE-lined at limit
Carbon Fiber (CF) Composites
Carbon fiber reinforced filaments (CF-PLA, CF-PETG, CF-nylon, CF-PC) contain chopped carbon fibers for increased stiffness, dimensional stability, and heat resistance. They are abrasive and require hardened steel nozzles.
- Nozzle temp: 220-260°C (depends on base polymer)
- Bed temp: 60-100°C
- Chamber temp: Depends on base polymer
- Drying: 4-6 hours (CF composites absorb moisture)
- Print speed: 30-50 mm/s (slower due to abrasion and viscosity)
- Nozzle: Hardened steel REQUIRED (brass wears in 5-10 hours)
- Difficulty: Moderate — nozzle wear is the main issue
- Hotend required: All-metal with hardened steel nozzle (QIDI high-temp includes one)
PEEK (Polyether Ether Ketone)
PEEK is a high-performance engineering plastic with exceptional mechanical properties, chemical resistance, and biocompatibility. It is used in medical implants, aerospace, and industrial applications. It is the most difficult desktop 3D printing material.
- Nozzle temp: 350-400°C
- Bed temp: 120-150°C
- Chamber temp: 60-90°C (critical — prevents crystallization issues)
- Drying: 6+ hours at 120°C
- Print speed: 20-30 mm/s (very slow)
- Cooling fan: 0% (controlled cooling only)
- Difficulty: Expert — requires precise control of all parameters
- Hotend required: All-metal, 350-500°C (QIDI high-temp at 350°C covers lower range; Slice Mosquito 500°C for full range)
PEKK (Polyether Ketone Ketone)
PEKK is similar to PEEK but with a lower melting point and better printability. It offers high strength, chemical resistance, and is more forgiving than PEEK.
- Nozzle temp: 350-380°C
- Bed temp: 120-140°C
- Chamber temp: 60-80°C
- Drying: 4-6 hours at 120°C
- Print speed: 25-35 mm/s
- Difficulty: Hard — easier than PEEK but still demanding
- Hotend required: All-metal, 350°C+ (QIDI i-Fast High-Temp suitable)
Complete Temperature Settings Table
| Material | Nozzle | Bed | Chamber | Speed | Fan | Dry | Hotend |
|---|---|---|---|---|---|---|---|
| PLA | 190-220°C | 50-60°C | Optional | 50-80 mm/s | 100% | No | Any |
| PETG | 220-240°C | 70-80°C | Optional | 40-60 mm/s | 50% | 2h@60°C | Any |
| ABS | 230-250°C | 90-110°C | 40-50°C | 40-60 mm/s | 0-30% | No | PTFE/all-metal |
| TPU | 210-230°C | 40-50°C | Optional | 20-40 mm/s | 100% | No | PTFE preferred |
| Nylon (PA) | 240-270°C | 80-100°C | 40-50°C | 40-60 mm/s | 30-50% | 4-6h@70°C | All-metal |
| CF-PLA/PETG | 220-250°C | 60-80°C | Optional | 30-50 mm/s | 50-100% | 4h@60°C | All-metal + hardened nozzle |
| CF-Nylon | 250-270°C | 80-100°C | 40-50°C | 30-50 mm/s | 30-50% | 6h@70°C | All-metal + hardened nozzle |
| Polycarbonate | 260-300°C | 100-120°C | 50-60°C | 30-50 mm/s | 0-30% | 4-6h@100°C | All-metal 300°C+ |
| PEKK | 350-380°C | 120-140°C | 60-80°C | 25-35 mm/s | 0% | 4-6h@120°C | All-metal 350°C+ |
| PEEK | 350-400°C | 120-150°C | 60-90°C | 20-30 mm/s | 0% | 6h+@120°C | All-metal 350-500°C |
Hotend Selection for High-Temp Printing
Why All-Metal Is Required Above 250°C
Standard hotends use a PTFE (Teflon) liner inside the heat break to guide filament. PTFE begins to degrade at 260°C, releasing toxic fumes and eventually melting or charring, which causes clogs. All-metal hotends replace the PTFE liner with a solid titanium or stainless steel tube that can withstand 300-500°C without degradation.
| Hotend Type | Max Temp | Materials | Lifespan | Heat Creep |
|---|---|---|---|---|
| PTFE-lined (normal) | 250°C | PLA, PETG, ABS, TPU | 6-12 months | Low |
| All-metal 300°C | 300°C | + nylon, lower PC | 12-18 months | Medium |
| All-metal 350°C | 350°C | + PC, PEKK, lower PEEK | 12-24 months | Medium |
| All-metal 500°C | 500°C | + full PEEK, PPSU | 18-24 months | High (needs good cooling) |
Recommended Hotends by Material
| Material | Min Hotend | Recommended | QIDI i-Fast Option |
|---|---|---|---|
| Nylon | 300°C all-metal | 350°C all-metal | QIDI i-Fast High-Temp ($100.99) |
| Carbon fiber | Any + hardened nozzle | 350°C all-metal + hardened | QIDI i-Fast High-Temp (includes hardened nozzle) |
| Polycarbonate | 300°C all-metal | 350°C all-metal | QIDI i-Fast High-Temp ($100.99) |
| PEKK | 350°C all-metal | 350-500°C all-metal | QIDI i-Fast High-Temp (350°C) |
| PEEK | 350°C all-metal | 500°C all-metal | QIDI i-Fast High-Temp (lower range) / Slice Mosquito (full) |
Chamber Temperature: The Hidden Requirement
Many beginners buy a high-temperature hotend but fail because they ignore chamber temperature. Engineering materials like PC, PEEK, and nylon warp dramatically if the ambient temperature is too low. The QIDI i-Fast has a fully enclosed chamber that can maintain 40-60°C during printing.
Why Chamber Temperature Matters
- Reduces warping: Large temperature gradients between layers cause internal stress and warping. A warm chamber minimizes this.
- Improves layer adhesion: If previous layers cool too fast, the next layer cannot fuse properly. A warm chamber keeps layers above glass transition temperature.
- Prevents cracking: PC and PEEK are prone to cracking if cooled too quickly. A 50-90°C chamber prevents thermal shock.
- Controls crystallization: PEEK and PEKK require controlled cooling to achieve the right crystalline structure for mechanical properties.
Chamber Temperature by Material
| Material | Min Chamber | Optimal Chamber | i-Fast Capable? |
|---|---|---|---|
| PLA/PETG | None | 20-30°C (room temp) | Yes (door open) |
| ABS | 30°C | 40-50°C | Yes (door closed) |
| Nylon | 30°C | 40-50°C | Yes |
| Polycarbonate | 45°C | 50-60°C | Yes |
| PEKK | 55°C | 60-80°C | Yes (may need insulation) |
| PEEK | 60°C | 70-90°C | Yes (with insulation, upper limit) |
Filament Drying: The #1 Cause of High-Temp Print Failure
Critical: Engineering filaments (nylon, PC, PEEK) absorb moisture from the air. Wet filament causes popping, stringing, bubbling, poor layer adhesion, and weak parts. ALWAYS dry engineering filament before printing — even if it is brand new.
Drying Settings by Material
| Material | Dry Temp | Dry Time | Storage | Symptoms of Wet |
|---|---|---|---|---|
| Nylon | 70°C | 4-6 hours | Sealed with desiccant | Popping, bubbling, stringing |
| Polycarbonate | 100°C | 4-6 hours | Sealed with desiccant | Bubbling, poor layer adhesion |
| PEEK | 120°C | 6+ hours | Sealed with desiccant | Popping, voids, weak parts |
| PEKK | 120°C | 4-6 hours | Sealed with desiccant | Popping, surface defects |
| CF composites | 60-70°C | 4-6 hours | Sealed with desiccant | Popping, rough surface |
| PETG | 60°C | 2-4 hours | Sealed | Stringing, bubbling |
| PLA | Not needed | — | Sealed (optional) | Minimal effect |
Drying Methods
- Filament dryer (recommended): Dedicated dryers like the PrintDry or Sunlu S2 maintain precise temperature and can hold 1-2 spools. Cost: $40-80.
- Food dehydrator: A cheap food dehydrator works for nylon and PETG at 60-70°C. Cost: $30-50. Not hot enough for PC/PEEK.
- Oven: A conventional oven can dry at 70-120°C. Risk: temperature spikes can melt filament. Use an oven thermometer. Cost: $0 (if you have one).
- Printer bed: For small amounts, you can dry filament on the printer bed at 60-100°C for 2-4 hours. Not ideal for full spools.
Bed Adhesion for High-Temp Materials
| Material | Bed Surface | Bed Temp | Adhesive | Notes |
|---|---|---|---|---|
| Nylon | PEI sheet / glass | 80-100°C | Nylon glue stick / PVA | Nylon warps — use brim/raft |
| Polycarbonate | PEI sheet / glass | 100-120°C | PC adhesive / hairspray | Strong adhesion — may damage PEI when removing |
| PEEK | PEI sheet / glass | 120-150°C | PEEK专用胶 / PVA | Requires very clean bed |
| PEKK | PEI sheet / glass | 120-140°C | PVA / PEKK adhesive | Similar to PEEK |
| CF composites | PEI sheet | 60-100°C | None (usually) | CF improves adhesion |
| ABS | PEI / glass | 90-110°C | ABS slurry / hairspray | Enclosure required |
Nozzle Selection for High-Temp Printing
Nozzle Material
| Material | Conductivity | Wear (CF) | Temp Limit | Price | Best For |
|---|---|---|---|---|---|
| Brass | 120 W/mK | 5-10 hours | 500°C | $2-5 | PLA, PETG, ABS, PC (non-abrasive) |
| Hardened Steel | 20 W/mK | 100+ hours | 500°C | $8-15 | CF, GF, wood, metal-fill, PEEK |
| Plated Copper | 350 W/mK | 50+ hours | 500°C | $10-20 | High-speed, PETG, TPU |
| Ruby Tip | Good (brass body) | 500+ hours | 500°C | $30-50 | Extreme abrasive, glow-in-dark |
Tip: The QIDI i-Fast High Temperature Hotend comes with a 0.4mm hardened steel nozzle, which is ideal for carbon fiber and high-temp materials. If you primarily print PLA/PETG, you can swap in a brass nozzle for better thermal conductivity (+5-15°C lower temp needed). The M6 thread is compatible with E3D V6-style nozzles.
Nozzle Size for High-Temp Materials
| Nozzle | Layer Height | Speed | Detail | Best For |
|---|---|---|---|---|
| 0.4mm (standard) | 0.12-0.28mm | 30-60 mm/s | Good | General purpose, PC, nylon |
| 0.6mm | 0.20-0.36mm | 40-80 mm/s | Medium | Functional parts, CF, fast PC |
| 0.8mm | 0.32-0.48mm | 50-100 mm/s | Low | Large parts, draft prints |
Print Speed & Cooling for Engineering Materials
Print Speed
High-temperature materials generally require slower print speeds than PLA. The molten filament needs time to flow through the nozzle and fuse with the previous layer. Printing too fast causes under-extrusion and poor layer adhesion.
| Material | Perimeter Speed | Infill Speed | First Layer | Travel Speed |
|---|---|---|---|---|
| Nylon | 40-50 mm/s | 50-60 mm/s | 20 mm/s | 100 mm/s |
| Polycarbonate | 30-40 mm/s | 40-50 mm/s | 15 mm/s | 80 mm/s |
| CF-Nylon | 30-40 mm/s | 40-50 mm/s | 15 mm/s | 80 mm/s |
| PEKK | 25-30 mm/s | 30-40 mm/s | 10 mm/s | 60 mm/s |
| PEEK | 20-25 mm/s | 25-30 mm/s | 10 mm/s | 50 mm/s |
Cooling Fan
Cooling is counterintuitive for high-temp materials. While PLA needs 100% cooling, engineering materials need minimal or zero cooling to prevent warping and delamination.
- Nylon: 30-50% fan — some cooling helps surface finish
- Polycarbonate: 0-30% fan — too much cooling causes delamination
- PEKK/PEEK: 0% fan — controlled cooling only via chamber temperature
- CF composites: 30-50% fan (depends on base polymer)
- Bridges/overhangs: You may need to increase fan for bridges, but this can cause warping. Use support structures instead.
Troubleshooting High-Temp Printing
| Problem | Cause | Solution |
|---|---|---|
| Warping (PC/PEEK) | Chamber too cold, bed temp too low | Increase chamber to 50-90°C, increase bed temp, use brim/raft, enclosure |
| Layer delamination | Nozzle temp too low, cooling too high, wet filament | Increase nozzle 10°C, reduce fan, dry filament 4-6h |
| Popping/bubbling | Wet filament | Dry filament at recommended temp/time, use sealed storage |
| Stringing (PC/nylon) | Temp too high, retraction too low, wet filament | Lower temp 5-10°C, increase retraction 1-2mm, dry filament |
| Under-extrusion | Nozzle worn (CF), temp too low, clog | Replace nozzle (hardened for CF), increase temp, cold pull |
| Nozzle clog (high temp) | Burnt filament, degraded material, foreign debris | Cold pull with nylon at 250°C, cleaning needle, replace nozzle/hotend |
| Heat creep jam | All-metal hotend, fan not working, dusty heatsink | Verify fan 100%, clean heatsink, improve ventilation, lower ambient |
| PEEK not crystallizing | Cooling too fast, chamber too cold | Increase chamber to 70-90°C, slow cooling, anneal after printing |
| Bed adhesion failure | Bed temp too low, dirty bed, wrong surface | Increase bed temp, clean with IPA, use adhesive, PEI sheet |
| Temperature fluctuation | Poor PID tuning, failing heater/thermistor | Run PID auto-tune at 250°C, check connections, replace components |
High-Temp Printing Safety
Safety First: High-temperature printing involves nozzle temperatures of 250-500°C and bed temperatures of 100-150°C. These can cause severe burns. Always: (1) Never touch the nozzle or bed when hot; (2) Use the printer's enclosure to prevent accidental contact; (3) Ensure good ventilation — some materials emit fumes at high temps; (4) Keep flammable materials away from the printer; (5) Never leave a high-temp print unattended for long periods; (6) Use a smoke detector near the printer.
Fume Safety by Material
| Material | Fume Risk | Recommendation |
|---|---|---|
| PLA | Low | Normal ventilation |
| PETG | Low-Medium | Normal ventilation |
| ABS | Medium (styrene) | Enclosure + ventilation, avoid breathing |
| Nylon | Medium | Good ventilation |
| Polycarbonate | Medium-High (BPA) | Enclosure + good ventilation |
| PEEK/PEKK | High at 350°C+ | Enclosure + fume extraction, avoid breathing |
| Carbon fiber | Medium (particles) | Enclosure, avoid breathing dust |
Getting Started with High-Temp Printing: Step-by-Step
Step 1: Upgrade to an all-metal high-temperature hotend. For QIDI i-Fast, install the QIDI i-Fast High Temperature Hotend ($100.99, 350°C, 12-min install).
Step 2: Update firmware max temperature if needed (Marlin: MAX_HEATER_TEMP, Klipper: max_temp). Set to at least 360°C for a 350°C hotend.
Step 3: Run PID auto-tune at 250°C (M303 E0 S250 C8 in Marlin) to optimize temperature stability for the new heater.
Step 4: Start with nylon (easiest engineering material). Dry nylon for 4-6 hours at 70°C. Set nozzle 250°C, bed 90°C, chamber 45°C, speed 40 mm/s, fan 30%.
Step 5: Print a simple test cube (20x20x20mm) to verify temperature, adhesion, and dimensional accuracy.
Step 6: Once nylon is dialed in, try polycarbonate (280°C nozzle, 110°C bed, 55°C chamber, 30 mm/s, 0% fan).
Step 7: For carbon fiber, install a hardened steel nozzle (included with QIDI high-temp) and dry the CF filament.
Step 8: Only attempt PEEK/PEKK after mastering PC and nylon. PEEK requires 350-400°C, 130°C bed, 70°C chamber, and very slow speeds.
Frequently Asked Questions
What is high-temperature 3D printing?
High-temperature 3D printing is FDM printing at nozzle temperatures above 250°C, requiring an all-metal hotend (no PTFE liner). It enables engineering materials: nylon (240-270°C), polycarbonate (260-300°C), carbon fiber composites (220-260°C), PEKK (350-380°C), and PEEK (350-400°C). Standard PTFE-lined hotends degrade above 250°C, releasing fumes and causing clogs. The QIDI i-Fast High Temperature Hotend ($100.99) reaches 350°C with an all-metal titanium heat break, 50W heater, and hardened steel nozzle.
What temperature do I need for PEEK, PC, and nylon?
Nylon: 240-270°C nozzle, 80-100°C bed, 40-50°C chamber. Polycarbonate: 260-300°C nozzle, 100-120°C bed, 50-60°C chamber. PEKK: 350-380°C nozzle, 120-140°C bed, 60-80°C chamber. PEEK: 350-400°C nozzle, 120-150°C bed, 60-90°C chamber. A 350°C hotend (QIDI i-Fast High-Temp) covers nylon, PC, CF, and lower-temp PEEK/PEKK. A 500°C hotend (Slice Mosquito) is needed for sustained 400°C PEEK printing. All engineering materials require drying and an enclosed chamber.
Do I need an enclosed printer for high-temp printing?
Yes, for most engineering materials. Polycarbonate requires a 50-60°C chamber to prevent warping and delamination. PEEK requires 60-90°C. Nylon benefits from 40-50°C. Without an enclosure, these materials cool too fast, causing warping, cracking, and layer separation. The QIDI i-Fast has a fully enclosed chamber that can maintain these temperatures. ABS can be printed without an enclosure but benefits from one. PLA and PETG do not require enclosure. If your printer is not enclosed, you can build an enclosure or use a printer cover, but reaching 60-90°C may be difficult.
Why do I need to dry engineering filaments?
Engineering filaments (nylon, PC, PEEK, PEKK) are hygroscopic — they absorb moisture from the air. When wet filament is heated, the moisture boils, causing popping, bubbling, stringing, voids, and poor layer adhesion. Nylon can absorb enough moisture in 24 hours to ruin prints. Drying settings: nylon 4-6h at 70°C, PC 4-6h at 100°C, PEEK 6h+ at 120°C, PEKK 4-6h at 120°C. Use a filament dryer ($40-80), food dehydrator, or oven. Store dried filament in sealed bags with desiccant. Even brand-new filament should be dried before high-temp printing.
What nozzle should I use for carbon fiber printing?
Use a hardened steel nozzle for carbon fiber, glass fiber, wood-fill, and metal-fill filaments. Brass nozzles wear in 5-10 hours with carbon fiber — the abrasive fibers erode the 0.4mm bore, causing under-extrusion and poor print quality. Hardened steel nozzles last 100+ hours. The QIDI i-Fast High Temperature Hotend comes with a 0.4mm hardened steel nozzle included. Ruby tip nozzles ($30-50) offer the longest lifespan (500+ hours) for extreme abrasive materials. Note: hardened steel has lower thermal conductivity (20 W/mK vs 120 for brass), so increase printing temperature by 5-15°C for the same flow rate.
Can I print PEEK on a QIDI i-Fast?
Yes, with the QIDI i-Fast High Temperature Hotend (350°C) and proper setup. PEEK requires: 350-400°C nozzle (the i-Fast high-temp reaches 350°C, covering the lower end of PEEK's range), 120-150°C bed, 60-90°C enclosed chamber, dried PEEK (6h+ at 120°C), hardened steel nozzle, and slow print speed (20-30 mm/s). For best results, PEKK (350-380°C) is more forgiving than PEEK on the i-Fast. For sustained 400°C PEEK printing, a 500°C hotend like the Slice Mosquito is recommended. Polycarbonate and nylon are the most practical high-temp materials for the i-Fast.
How do I prevent warping with polycarbonate?
Prevent PC warping with: (1) Enclosed chamber at 50-60°C — the i-Fast enclosure works well; (2) Heated bed at 100-120°C; (3) Clean PEI sheet or glass with PC adhesive/hairspray; (4) Brim or raft for large parts; (5) Slow first layer (15 mm/s); (6) 0-30% cooling fan (too much cooling causes warping); (7) Dry filament (4-6h at 100°C); (8) Avoid drafts — keep the enclosure door closed. If warping persists, increase chamber temperature by 5-10°C or use a larger brim. PC is one of the most warp-prone materials, so chamber temperature is critical.
What is the best high-temp hotend for the QIDI i-Fast?
The QIDI i-Fast High Temperature Hotend ($100.99) is the best and only plug-and-play high-temp hotend for the i-Fast. It features an all-metal titanium heat break, 24V 50W heater, NTC 100K thermistor, 0.4mm hardened steel nozzle, and pre-wired JST connectors. It installs in 10-15 minutes with zero modification — no soldering, no custom brackets, no firmware changes. It reaches 350°C, covering PC, nylon, CF, PEKK, and lower-temp PEEK. Universal hotends (E3D V6, Slice Mosquito) require custom mounting and wiring, making them impractical for the i-Fast. The high-temp hotend costs only $10 more than the standard version.
How do I set up firmware for high-temperature printing?
After installing a high-temp hotend, check and update firmware settings: (1) Maximum temperature — Marlin: MAX_HEATER_TEMP in Configuration.h, set to 360°C+ for a 350°C hotend. Klipper: max_temp under [extruder]. (2) PID tuning — run M303 E0 S250 C8 (Marlin) or PID_CALIBRATE HEATER=extruder TARGET=250 (Klipper), then save with M500/SAVE_CONFIG. (3) Thermistor type — the QIDI high-temp uses NTC 100K (same as standard), so no change needed. (4) Minimum temperature for cold extrusion prevention — set MINTEMP to 170°C. (5) The QIDI i-Fast firmware may already support high temps — check the temperature menu for the maximum setting.
Is high-temperature printing safe?
High-temperature printing is safe with proper precautions: (1) Never touch the 250-500°C nozzle or 100-150°C bed — use the printer's enclosure; (2) Ensure good ventilation — PC, ABS, and PEEK emit fumes at high temperatures; use fume extraction for PEEK; (3) Keep flammable materials away; (4) Do not leave high-temp prints unattended for long periods; (5) Use a smoke detector near the printer; (6) All-metal hotends eliminate PTFE fume risk (unlike PTFE-lined hotends above 260°C); (7) Allow the printer to cool before opening the enclosure after PEEK/PC prints. The QIDI i-Fast's enclosed design improves safety by containing heat and fumes.
